/*
 * Copyright (c) 2000 jPOS.org.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *    "This product includes software developed by the jPOS project 
 *    (http://www.jpos.org/)". Alternately, this acknowledgment may 
 *    appear in the software itself, if and wherever such third-party 
 *    acknowledgments normally appear.
 *
 * 4. The names "jPOS" and "jPOS.org" must not be used to endorse 
 *    or promote products derived from this software without prior 
 *    written permission. For written permission, please contact 
 *    license@jpos.org.
 *
 * 5. Products derived from this software may not be called "jPOS",
 *    nor may "jPOS" appear in their name, without prior written
 *    permission of the jPOS project.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
 * IN NO EVENT SHALL THE JPOS PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the jPOS Project.  For more
 * information please see <http://www.jpos.org/>.
 */

package com.nasoft.iso.packager;

import com.nasoft.core.Configurable;
import com.nasoft.core.Configuration;
import com.nasoft.core.ConfigurationException;
import com.nasoft.core.ReConfigurable;
import com.nasoft.iso.ISOComponent;
import com.nasoft.iso.ISOException;
import com.nasoft.iso.ISOPackager;
import com.nasoft.util.LogSource;
import com.nasoft.util.Logger;

/**
 * Wrapper on standard packager
 * 
 * @author bharavi gade
 * @version $Revision: 1.3 $ $Date: 2003/05/16 04:15:15 $
 * @see ISOPackager
 */
public abstract class PackagerWrapper implements ISOPackager, LogSource,
    ReConfigurable
{
  protected Logger        logger           = null;
  protected String        realm            = null;
  protected ISOPackager   standardPackager = null;
  protected Configuration cfg;

  public PackagerWrapper()
  {
    super();
  }

  public abstract byte[] pack(ISOComponent c) throws ISOException;

  public abstract int unpack(ISOComponent c, byte[] b) throws ISOException;

  public String getFieldDescription(ISOComponent m, int fldNumber)
  {
    return standardPackager != null ? standardPackager.getFieldDescription(m,
        fldNumber) : "";
  }

  public void setPackager(ISOPackager packger)
  {
    this.standardPackager = packger;
  }

  public ISOPackager getPackager()
  {
    return standardPackager;
  }

  public void setLogger(Logger logger, String realm)
  {
    this.logger = logger;
    this.realm = realm;
    if (standardPackager instanceof LogSource)
      ((LogSource) standardPackager).setLogger(logger, realm);
  }

  public String getRealm()
  {
    return realm;
  }

  public Logger getLogger()
  {
    return logger;
  }

  /**
   * requires <code>inner-packager</code> property
   * 
   * @param cfg
   *          Configuration object
   * @throws ConfigurationException
   */
  public void setConfiguration(Configuration cfg) throws ConfigurationException
  {
    this.cfg = cfg;
    String packagerName = cfg.get("inner-packager");
    try
    {
      Class p = Class.forName(packagerName);
      setPackager((ISOPackager) p.newInstance());
      if (standardPackager instanceof Configurable)
        ((Configurable) standardPackager).setConfiguration(cfg);
    } catch (ClassNotFoundException e)
    {
      throw new ConfigurationException("Invalid inner-packager", e);
    } catch (InstantiationException e)
    {
      throw new ConfigurationException("Invalid inner-packager", e);
    } catch (IllegalAccessException e)
    {
      throw new ConfigurationException("Invalid inner-packager", e);
    }
  }
}
